second-brain

Local-first personal knowledge base CLI with hybrid search, an entity graph, and LLM enrichment over notes.

Desktopfreeglobal

second-brain is a free, open-source local-first personal knowledge base CLI that combines hybrid search, an entity graph, and LLM enrichment over a user's notes, transcripts, Slack, and Gmail, running entirely on local Ollama models and queryable by any AI agent. It's for power users who want an AI-searchable knowledge base built from their own data without sending it to the cloud.

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Behind the summary, Matchbox keeps a richer profile of second-brain - the signals our matcher actually reads to decide when to surface it. It stays private; claim the listing to see and control it.

Problem & pain-point mapping
Who we surface it to (audience fit)
What it's a strong alternative to
Trust & credibility signals

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